Hulbert, A. B. (1933). Where rolls the Oregon: Prophet and pessimist look northwest. The Stewart Commission of Colorado College, Denver Public Library.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Hulbert, Archer Butler. Where Rolls the Oregon: Prophet and Pessimist Look Northwest. [Colorado Springs] [Denver]: The Stewart Commission of Colorado College, Denver Public Library, 1933.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Hulbert, Archer Butler. Where Rolls the Oregon: Prophet and Pessimist Look Northwest. The Stewart Commission of Colorado College, Denver Public Library, 1933.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.